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[Civl] Enhance quantifier elimination #829

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merged 2 commits into from
Jan 2, 2024
Merged

[Civl] Enhance quantifier elimination #829

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9ddf3b1
add code change
shazqadeer Dec 31, 2023
4ade00f
added test example
shazqadeer Jan 2, 2024
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5 changes: 5 additions & 0 deletions Source/Concurrency/TransitionRelationComputation.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -374,6 +374,11 @@ private void TryElimination(IEnumerable<Variable> extraDefinedVariables)
varToExpr[assignment.Var] = SubstitutionHelper.Apply(varToExpr, assignment.Expr);
changed = true;
}
else if (Defined(assignment.Var) && assignment.Expr is IdentifierExpr ie && !Defined(ie.Decl))
{
varToExpr[ie.Decl] = SubstitutionHelper.Apply(varToExpr, Expr.Ident(assignment.Var));
changed = true;
}
else
{
remainingAssignments.Add(assignment);
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14 changes: 14 additions & 0 deletions Test/civl/regression-tests/qelim1.bpl
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@@ -0,0 +1,14 @@
// RUN: %parallel-boogie "%s" > "%t"
// RUN: %diff "%s.expect" "%t"

atomic action {:layer 2} AtomicFoo() returns (o: int)
{
var y: int;
o := y;
}
yield procedure {:layer 1} Foo() returns (o: int)
refines AtomicFoo;
{
var x: int;
o := x;
}
2 changes: 2 additions & 0 deletions Test/civl/regression-tests/qelim1.bpl.expect
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@

Boogie program verifier finished with 1 verified, 0 errors
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